Japanese · Pronunciation Guide
do-a, two separate beats — nothing like the single syllable of English "door."
doa
Two slots made of two adjacent vowels, which is exactly the configuration English fuses. The borrowing dropped the English r entirely and replaced the vowel with a two-mora sequence, so the Japanese word is longer and structurally quite different from its source.
Listen: ドア
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このドアは重いです。
Kono doa wa omoi desu.
This door is heavy.
Listen: このドアは重いです。
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このドアは重いです pairs the loanword with 重い (o-mo-i), which also ends in a vowel sequence that must not fuse. Two words in one short sentence, both of which English intuition would compress — and both of which need their vowels articulated separately.
Saying "door" with a Japanese accent gives one beat and an r that isn't there. Say "do" and then "a" as two distinct pulses. Learners also import the English vowel, which is much darker; Japanese o here is a pure mid-back vowel and the a that follows is bright and open.